Pump.



O. L. CLARK.

PUMP.

APRLICATlON FILED A'PR.20, 1911.

Patented Biay-16,1916.

In CLARK, F 'MODONALD, PENNSYLVANIA, ASSIGNORJ TU ERICK LIND$AY 632%, @F PITTErBURG-H, PENNSYLVANIA, A CORPORATION OF NEW rune. h

masher.

Specification of Letters'JPatent.

Patented May re, rare.

Application filed. April 20, 1911. Serial No. 622,370.

To all rv/tom it may concern:

Be it. lniown that I, OLIVER L. CLARK, a

citizen of the United States, resident of- McDonald, in the county pf Washington 5 and State of Pennsylvania, have invented a new and useful Improvement in Pumps; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to pumps, and parthe oil or other fluid is actually raisedthrough the well being accomplished entirely by pull on such line.

In my United States Letters Patent No. on 739,831, I have described and claimed a pump of this type, and the object of my invention is to improve on the construction of this pump for certain purposes and to meet certain special conditions.

To these ends my invention contemplates, generally stated a pump of this character employing an outer tube, a worldng barrel within said tube and communicating therewith, a valve controlling the inlet of fiuid 30 to said tube, anda pumping piston in the .working barrel actuated through a hollow piston-rod, the said hollow piston-rod communicating with the working barrel and having an outlet above the working barrel 5 controlled by a valve.

My invention also consists in other features of construction as more particularly described hereinafter and claimed.

In the accompanying drawings, Figure 1 w is a vertical section through apump illustrating my invention. Fig. 2 is a like view illustrating the parts in another position. Ifig. 3 is a horizontal cross section on the line 3-3 Fig. 1; and Fig. 4 is a like section e on the line 44- Fig. 1. Fig. 5 is a detail vertical section on a larger scale illustrating the lower end of the'working barrel shown 1n Figs. 1 and 2. Fig. 6 is a plan view of the same and Fig. 7 is a horizontal cross to section on the line 7-7 Fig. 5. V

Thepump 1 illustrated has the outer tube or' caslng 2 which is lowered into the well at the lower end of the well tubing. The

tube or casing when in use is suspended near it the bottom of the open well, and is providedpreferably with the annular foot portion 5 having the tapered or conical bore 6 in which fits the tapered lower end 7 of the working barrel 8. The lower end or plug 7 of the working barrel 8 comprises the tube 9 surrounded by the packing rings 10 preferably arranged so as to have their outer faces at a taper corresponding to the conical bore 6 of the lower portion or foot 5 of the tube 2, so that the working barrel proper 8 into which the plug 7 is screwed at 11 will not be drawn from fixed position within the casing'2 at the first stroke of the piston 12. The lower end or plug 7 of said working barrel has a cage 13 above the tube 9 containing a-ba-ll valve 14 adapted to fit within the Valve seat 15 and close the tube 9. An

escape valve 17 is also preferably employed Q to provide for the exit of fluid leaking past the piston 12 into the cage 13, the said escape valve comprising preferably a conical valve head 18 closing the port 19 in the head 20 of the working barrel proper, and having a valve stem 20 provided with a compression spring 22 between the perforated spring seat 23 and the head 20. The working barrel 8 communicates at its upper end with the tube 2, being provided with the ports 24: adapted to admit fluid from the space between the tube and working barrel into the working barrel, on the downward stroke of the piston 12. The piston 12 is attached to the lower end of the hollow piston rod or stem 26 by the case 27 and is provided with suitable packing rings 28 secured on its threaded end 29 by the packing nut 30. The

upper portion or cage 27 of the piston 12.

has the apertures 28' through which the oil or like fluid is admitted to thehollow bore or passage 29 through the piston rod 26, the upper portion 2 of the said cage being preferably-in the form of a bushing screwed onto the threaded lower end of the piston stem 26 at 27. It will be understood, however, that the means for admitting fluid from the working barrel 8 to the bore 29 of the piston rod 4may bemodified materially without departing from the scope of my invention. It is further apparent that the employment of the escape valve 17 is optional, it being desirable, however, to clear the lower end of the working barrel 8 of fluid leaking past the solid piston 12. The piston rod 4 reciprocates within the gland 31 provided with the packing material 32 confined, by the packing nut 33. The gland 31 has a reduced 7 portion 31 provided with the packing rings 34 which fit within the bore 35 of the upper which is threaded at 36' to the piston rod 4,

the said ball 35 being forced by the fluid above it into a concave seat 35 in the down 1. During this upward stroke of the piston.

whatever oil or like fluid is present within the working barrel 8 above the piston 12 passes through the hollow piston-rod 4 and past the ball valve up into the well, the

return of fluid downwardly through the tube 9 being prevented by the closure of the valve 14. This leaves a vacuum below the piston 12 within the barrel 8, so that the downwardstroke of said piston is secured by the pressure of fluid within the well above, and fluid is sucked into the space between the tube 2 and barrel 8 past the valve 14, which is now in the position illustrated in Fig. 2. In the regular operation of the pump, therefore, at each downward stroke of the piston 4 the oil within the tube 2 around the barrel 8 is sucked into the barrel 8 above the piston through the ports 24, the downward entrance of oil through the hollow piston rod 4 being prevented by the downwardly closing valve 35. Oil is like wise drawn past the upwardly opening valve 14 into the space between the tube 2 and'barrel .8. The barrel 8 being, at the completion of the downward stroke, filled with oil, as well as the space within the tube 2, the upward stroke of the piston rod 4 forces this oil through the cage openings therethrough '28 and hollow piston rod 4 past the upwardly opening valve 35*, the valve 14' being closed by the downward'pressure of 011 within the tube 2.

In the form of pump illustrated, a perfect vacuum is maintained below the piston 12 at each upward stroke by the escape valve 17, which opens by the pressure in any material quantity of oil above it which has leaked past the piston 12 at the end of its downward stroke, as indicated in Fig.2. I

This feature, however, forms in itself no part of my present invention.

What I claim is:

1. In a pump, the combination with a tube and a working barrel within said tube and communicating therewith, of a valve adapted to admit fluid to said tube, a piston in said working barrel provided with a hollow piston rod having an opening in said working barrel, a cage attached to the upper end of said piston rod and movable by the operating line, and a ball valve in said cage controlling the outlet of said hollow piston, said working barrel being closed to the admission of fluid below said piston and having means to permit the escape of oil from the working barrel'below saidpiston.

2. In a pump, the combination of a tube, a working barrel therein having an opening near its upper end communicating with said tube, and a valve at its lower end controlling the admission of said fluid to said tube, said barrel being closed to the admission of fluid from said tube at its lower end, a pumping piston within said working barrel provided with a cage having openings communicating with said working barrel, a piston'rod having a longitudinal passage communicating with said openings, a cage attached to the upper end of said piston rod, and a valve therein, said working barrel having meansto permit the escape of oil therefrom below said piston, substantially as described.

In testimony whereof, I, the said OLIVER L. CLARK, have hereunto set my hand.

OLIVER L. CLARK.

Witnesses:

ALICE M. GODFREY, ROBERT C. TOTTEN. 

